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Abstract:
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The preceding discussion and review of literature show
that studies on gear selectivity have received great
attention, while gear efficiency studies do not seem to have
received equal consideration. In temperate waters, fishing
industry is well organised and relatively large and well
equipped vessels and gear are used for commercial fishing
and the number of species are less; whereas in tropics
particularly in India, small scale fishery dominates the
scene and the fishery is multispecies operated upon by
nmltigear. Therefore many of the problems faced in India
may not exist in developed countries. Perhaps this would
be the reason for the paucity of literature on the problems
in estimation of relative efficiency. Much work has been
carried out in estimating relative efficiency (Pycha, 1962;
Pope, 1963; Gulland, 1967; Dickson, 1971 and Collins, 1979).
The main subject of interest in the present thesis is an
investigation into the problems in the comparison of fishing
gears. especially in using classical test procedures with
special reference to the prevailing fishing practices (that
is. with reference to the catch data generated by the
existing system). This has been taken up with a view to
standardizing an approach for comparing the efficiency of
fishing gear. Besides this, the implications of the terms
‘gear efficiency‘ and ‘gear selectivity‘ have been examined
and based on the commonly used selectivity model (Holt,
1963), estimation of the ratio of fishing power of two gear
has been considered. An attempt to determine the size of
fish for which a gear is most efficient.has also been made.
The work has been presented in eight chapters |